. . . . "1124400"^^ . . . . . . . . "3816"^^ . . "The Southern Great Lakes Derecho of 1991 is the derecho event that occurred on July 7 and 8, 1991. It lasted 17 hours and raced from South Dakota through southern Michigan before dying out over Western Pennsylvania."@en . . . . . . . . "Southern Great Lakes Derecho of 1991"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "1118868366"^^ . . . . . . . . "The Southern Great Lakes Derecho of 1991 is the derecho event that occurred on July 7 and 8, 1991. It lasted 17 hours and raced from South Dakota through southern Michigan before dying out over Western Pennsylvania."@en . . . . . . . . . . . . . . . . . . . . . . . . . . .